RFR: 8336315: tools/jpackage/windows/WinChildProcessTest.java Failed: Check is calculator process is alive

[Vanitha B P]

tools/jpackage/windows/WinChildProcessTest.java was failing intermittently, fixed the issue and changes are tested.

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Commit messages:
 - 8336315: tools/jpackage/windows/WinChildProcessTest.java Failed: Check is calculator process is alive

Changes: https://git.openjdk.org/jdk/pull/20312/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20312&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336315
  Stats: 20 lines in 2 files changed: 6 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/20312.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20312/head:pull/20312

PR: https://git.openjdk.org/jdk/pull/20312